How to make block works till specific date?

Im about to rent some IMAG. Is it possible to make block works for exaple for one week or till specific date? Should i use Java? Or clock time modifier is the way?

There’s no such functionality. If you build Notch Blocks for others, you need to make sure you protect your work through the contract you have with your clients.

As for the block working, if you are also renting them Playback licenses, these are available as weekly licenses and once expired, the Block will return to play with a watermark/not be usable in a live setting. Perhaps that is an option?