Entertainment executives meeting privately with President Barack Obama Tuesday asked him to ensure copyright protections are enshrined in new trade agreements and help facilitate better relations between Silicon Valley and Hollywood, according to people familiar with the discussions. Mr. Obama spoke with a who’s-who of major studio and network leaders, including Walt Disney Co. CEO Robert Iger, CBS Corp. CEO Leslie Moonves, and Kevin Tsujihara, the head of Time Warner’s Warner Brothers. The nearly hour-long discussion occurred after the president took a tour of the DreamWorks Animation SKG Inc. campus in Glendale Calif. and before he delivered an address on the economy to the crowd there. The largely Democratic entertainment industry has been a stalwart supporter of Mr. Obama, a trend continued on this trip with fund raisers hosted by “Friends” co-creator Marta Kauffman and media mogul Haim Saban.