Ivan Buchta and Martin Pezlar were arrested after being accused of spying on Greek military installations on the island of Lemnos. They've since spent 81 days in jail, with the Czech president recently asking the Greek president to treat their case with "special care."
In the note, the Czech devs say they are being treated well, and that they are doing their best "to stay optimistic and use this time well." They go on to thank the 14,000+ signatories of the petition created to show support for the detained pair.
We have a full version of the note in text after the break.