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Encrypt PDFs with Time Sensitive Password

I sell PDF downloads on my site [url removed, login to view] and want to restrict buyers to only being able to open the PDFs 5 times, or to being able to only open the PDF for 5 days after they buy it.

To do this job you will probably need a high end digital rights management application.

the idea is that I will send you the PDFs, you encrypt them or modify them or whatever and then send them back.

The modification should travel with the PDF, embedded in the PDF itself.

the following sites sell the kind of software required to edit the PDFs;

[url removed, login to view]

[url removed, login to view]

[url removed, login to view]

Unfortunately they are way too expensive for the level of business that I generate, so I need someone who already owns that sort of software to modify 20 PDFs on a file by file basis.

If you can help, please work your magic on the file in the attachment so I can see what you can do.

To clarify the requirements:

The password must last for only 5 days after the file is first opened. If the user downloads the file today, but doesn't opn it until next week, then the 5 days counting starts from next week.

Or the user is able to open file 5 times only, then the password expires. If file is copied after 3 openings, new copy can only be opened 2 times.

Or if the password is set to expire 5 days after first opening, and someone copies the file 3 days after opening, then it must be possible to only open the copy for t2 days more.

The password locking must travel with the file. So that no one can copy the file and keep it alive by opening the copies.

Attached is a sample file to which you can test your method in order to show me your ability to do this job.

Skills: PDF

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About the Employer:
( 23 reviews ) Aldgate, Australia

Project ID: #2517745

4 freelancers are bidding on average $150 for this job

zamoldar

please check pm

$250 USD in 5 days
(1 Review)
2.8
kbansal

Hi, Please check PM. Regards Kapil

$150 USD in 1 day
(3 Reviews)
2.7
honestmanish7

hellow sir..though I am new in freelancer ,I am well experienced in such kind of work.so please give me chance to work with you.I am waiting for your answer.

$100 USD in 5 days
(0 Reviews)
0.0
kilan

my company poses necesare tools to do what encription in bach (demo will applay in 2 hours )

$100 USD in 2 days
(0 Reviews)
0.0