Compromising, perhaps fatally, its Windows NT-on-Alpha strategy, Digital Equipment Corp yesterday made it appear that the Pentium Pro offers unbeatable value in servers by launching two families priced significantly below similar competitors’ products. The Prioris XL 6000 series will go from $2,000 to $4,000 and the MX 6200 series is from $3,000 to $5,000. The MX, for instance, is 25% to 35% below a similar Compaq Computer Corp line. Meanwhile, DEC also announced it had finally won US Department of Commerce approval to export 56-bit encryption security products outside the United States, which it claims gives it the kudos of being able to sell the strongest Internet commerce-protective security system worldwide. The deal covers 56-bit encryption capability in its OpenVMS OS, its RoadAbout/DES wireless LAN product, and AltaVista Tunnel search software.