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? no diff other than order
"A little time, a little trouble, your better day"
Badfinger
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jmaida wrote: ? no diff griff other than order
FTFY
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"A little time, a little trouble, your better day"
Badfinger
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I must remember to introduce you Zathras, Zathras and Zathras down on Epsilon Three. But not Zathras, he's a real jerk.
Be wary of strong drink. It can make you shoot at tax collectors - and miss.
Lazarus Long, "Time Enough For Love" by Robert A. Heinlein
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Quote: Yes, Zathras understand. No, Zathras not understand, but Zathras do. Zathras good at doings, not understandings. Zathras honored to meet you for many reasons.
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Is this one of those UNICODE jokes?
Software Zen: delete this;
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I write some useful papers and put them into PDF file and plan to sell these papers if possible.
I need to add the password to protect them. What is the best software to add these protections such as passord?
do I have alternatives other than PDF format?
diligent hands rule....
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There are lots of resources for encrypting PDF files, both locally and online.
HOWEVER the encryption used is weak, and there are also lots of resources online for cracking encrypted PDFs.
If you are serious, you will need to find something stronger than PDF passwords.
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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thanks for the thoughts. I did find one from online: wondershare.com
diligent hands rule....
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PDF Encrypt[^] is one such free tool that does what you want.
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Just to add to what the other two have said, it's probably a good idea to remember Robert A. Heinlein: Anything free is worth what you paid for it
and Source not clear: If you're not paying for it; you are the product
So I'd be careful when choosing anything to protect your IP.
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Thanks OG
diligent hands rule....
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thank you for this link!![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
diligent hands rule....
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Hypothetically, why would the owner of this service not copy and store all the PDFs you want to encrypt?
If I offered random encrypted PDFs in bulk batches on the DarkWeb for sale, I'm sure it would fetch a couple of bucks. 20? 30 per batch of 1.000?
If I scanned and labeled these properly, I might even be able to sell some of them for 10 bucks a piece.
That would pay for the ad-sense and basic website design in no time, making it a nice passive revenue stream on the side of a larger and probable even more illicit business venture.
Because of this hypothetical, I never use free online services, and I advice everyone with common sense not to use them either.
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That makes sense, I would not use this service for sensitive information.
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That's how I feel about sites which provide "secure image sharing". Were I running such a site, I would definitely be interested in seeing those images myself. 
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An easier option may be to zip your files (which will make them smaller as an added benefit) and put a password on the zip.
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zipping with password works for me.
"A little time, a little trouble, your better day"
Badfinger
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this is not an option for me...
diligent hands rule....
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I just remembered something.
Syncfusion has a pretty decent PDF library and it has a community license which I believe matches Visual Studio's.
You should check out the details yourself to see if you're elligible, but here's how you can secure your PDF file: Working with Security | Syncfusion[^]
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You may also want to look into adding a watermark which indicates who you originally sold the file to.
Back in 2004 I paid for a PDF of ISO 8601, and it has one. Or maybe that feature has been broken.
Sometimes you have to settle for detection what prevention won't work.
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The Wood Working YouTube community has been selling project plans for a long time
Here you buy and pay for the plan then You will receive this digital product immediately after purchase!
Here is a link
[^]
Reach out to Matt nice person he can offer insight on the process
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Half joke. Use their credit card number. They will not share the password that way.
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I think the simple answer is that there is no easy solution to your problem. You can password, encrypt, or convert to a specific reader format but at the end of the day, your paying customers have to be able to view them.
IP content providers are protected by copyright, which is an ugly road to pursue even for large companies. Your product protection depends on your market. If it's something that millions of people might buy, you create your pricing to be attractive to the customers and make it a 'no-brainer'. Most people aren't going to jump through a lot of hoops to save a $3 cost. In a smaller market where the cost per user may be higher, you're relying on the "professionalism" of your customers.
It's impossible to create a digital document that is not copyable at some level. A password keeps someone from just posting a link to the document, but doesn't stop them from blatantly publishing the password. An activation key works well on large documents but still doesn't defeat snip 'n sketch.
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