From CP via CTV.ca:

The Canadian Radio-television and Telecommunications Commission is tightening its rules to limit concentration of media ownership.

The changes, announced Tuesday, mean any person or company can own only two of the three different types of outlets -- radio, television or newspapers -- in a single market.

The regulator is also limiting ownership of broadcasting licences to ensure any one group does not control more than 45 per cent of the total television audience share as a result of a transaction.

"The whole thing was a great concern,'' CRTC chairman Konrad von Finckenstein said in an interview.

"Everybody is concerned about it, because the trend is there . . . toward media concentration. On the other hand, we want to make sure there is a plurality of voices and a diversity of programming.''

The regulator also will not approve transactions between cable and satellite companies that distribute television services, which it says would result in one group effectively controlling the delivery of programming in a market.

Von Finckenstein said Tuesday's restrictions do not apply retroactively to existing media conglomerates.