I am busy doing some training videos. I want to limit copying. I must presume that a disk can have a simple password screen before allowing access to the video files. Then I need it to change the password every 3 months. I in turn can email the users the new password. I have in mind that the password is the same for everyone. Of course they can still forward the password to each other.
I am not too worried about copying, but want to charge a monthly fee, hence my desire to have a method to cut off.
Also the password issue will be a useful feature to have, so that a trial period can be offered.
I was wondering if this piece of software is easily available at not too great an expense. Also any other basic ideas to protect my self would be appreciated.

The second piece of software is a test and mark feature. So a person enters the answers, multiple choice, and a mark is calculated whereafter a certificate saying sorry or well done is printed.