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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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Yup, contact the RIAA etc and ask how goes the war on the DRM front.
Make paying as easy as possible, accept everything you can.
There is probably? negative-ROI on trying to encrypt the PDF files. You'll invest more in effort than you save in preventing thievery.
It might? be better to provide authenticated access to a webserver that turns the documents into pictures and shows them in a browser. Nothing will stop a screen grab but depending on the info and the value of having it as actual text it might (moreso than encrypting PDF files) make it worth your PDF price tag.
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Wordle 726 4/6
🟨⬜⬜⬜⬜
⬜⬜🟨⬜🟩
⬜🟩⬜⬜🟩
🟩🟩🟩🟩🟩
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Wordle 726 5/6
🟨⬜⬜🟨⬜
⬜🟩⬜🟨⬜
⬜🟩⬜⬜🟩
🟩🟩⬜⬜🟩
🟩🟩🟩🟩🟩
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Wordle 726 4/6*
🟨⬜⬜⬜🟩
⬜⬜🟨⬜🟩
🟩🟩⬜⬜🟩
🟩🟩🟩🟩🟩
That was pure luck: loads of options for that last one! 
"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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⬜⬜🟨⬜🟩
⬜⬜⬜⬜⬜
⬜🟩⬜⬜🟩
⬜🟩⬜⬜🟩
🟨🟩⬜⬜🟩
🟩🟩🟩🟩🟩
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
modified 15-Jun-23 3:44am.
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Wordle 726 4/6*
⬜⬜🟨🟨⬜
⬜⬜🟨⬜🟩
🟨🟩⬜⬜🟩
🟩🟩🟩🟩🟩
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Wordle 726 5/6
⬛⬛🟨⬛🟩
⬛🟩⬛⬛🟩
🟩🟩⬛⬛🟩
🟩🟩⬛⬛🟩
🟩🟩🟩🟩🟩
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Wordle 726 4/6
⬜⬜⬜⬜⬜
⬜⬜🟨🟨⬜
⬜⬜🟨⬜🟩
🟩🟩🟩🟩🟩
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Wordle 726 3/6
⬜🟩⬜⬜🟨
🟩🟩🟩⬜⬜
🟩🟩🟩🟩🟩
"A little time, a little trouble, your better day"
Badfinger
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Wordle 726 6/6
⬛⬛🟨⬛🟩
⬛🟩⬛⬛🟩
⬛🟩⬛⬛🟩
⬛🟩⬛⬛🟩
⬛🟩🟩⬛🟩
🟩🟩🟩🟩🟩
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#Worldle #509 2/6 (100%)
🟩🟩🟩🟩⬜⬇️
🟩🟩🟩🟩🟩🎉
https://worldle.teuteuf.fr
"A little time, a little trouble, your better day"
Badfinger
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Extravagant teacher with battery, element opening. (10)
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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Profligate ?
Don't entirely get the clue but, this is what I have
Definition extravagant
Teacher = Prof
Element = li (list item element or battery)
Opening = gate
I read it as both element and, element opening
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
modified 14-Jun-23 4:20am.
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My thinking was Li as in "battery element". The old cruciverbalist's distracting comma didn't work, obviously.
YAUT!
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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I always ignore punctuation - I think you and I have been doing cryptic crosswords a long time ( ~ 55 years for me )
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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Let's see who you really are ...[^]
"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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God I'd forgotten about him 
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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