LOS ANGELES, Dec. 19, 2018 (GLOBE NEWSWIRE) -- via OTC PR WIRE -- OKTV (Opportunity Knocks Television), a wholly owned subsidiary of Purespectrum Inc . ( PSRU:OTC ), has penned a deal that has industry heavyweight, Trifecta Entertainment , as its exclusive advertising sales representative. OK TV PR Dec. 19 Under the agreement, which is set to come into effect at the end of this year, Trifecta Entertainment will bring in both advertisers and programming. The independent multimedia company is...