Whichever site you are using for that information is incorrect. EDIG disclosed it in its own filings as a discounted purchase of non-registered shares.
He can not sell these shares until they are registered.
I agree that he is the only one who has shown any apparent belief in company over the last two years with any purchase at all. The execs and board members have not shown that thy believe the share price is below where it will be in the future by buying either on the open market or by exercising ISOs. Remember though that Diaz's company is also a vendor to EDIG in that it provides the domain server for the wedigmusic site. Some of the money he paid for the shares may have been paid back to him in hosting services.
However, that is a market indicator that insiders believe the long term trend in share price will continue down. So far, they have been correct. FF, RP and RW sold 8 cent ISO shares on the open market only days after the price peaked, using the PR announcing that they had applied for a NASDAQ listing and believed they met all of the qualifications. FF exercised more cheap ISOs right around the time of the NASDAQ rejection to try to show support, but it didn't help.
The insider activity at EDIG has been a reliable indicator so far. They smartly cashed out near the peak and haven't been throwing money away by buying or exercising ISOs while the share price keeps tanking.
IMO, the worst of the insiders was Bryan Jones, who not only has never bought shares but sold the wedigmusic web site to EDIG for stock ($50,000?). IMO, the claim that the site already had over 25,000 registered users was completely false.