求解一段PHP代码的加密方式

求解一段PHP代码的加密方式 一下为加密的代码~~~~~~~~~~~~~~~~~ <?php $license_code='7YEwpmL99aobRhKXS64HfRe+Jf2Tj+0bYrv9WOOOQ5PssccfoMssZ69SyQMkwkI9kqh7+1F5dfS97tfD1F+yg3kiBFgdRQSJQ+6d/AyApO134AgsX/eEI9BTOPizOiqMiRgbfkY67W5cnBub6P6YpLiH2GDojEAV+91r9+hNMYi26Fqd/kg6ApTUJjMusG4EI5TaEtj/XfOojaU0p2FpjcmeXXxasyJDGVbMRxrc1asI+5zyr9TRQMci6gG0EIO6WE1stYPmpS5OyZqy2TLSmqk5FZenqAqzNuo14hmfjBeLDXlXGRnujxXgUME9pGXKXnYzkMtIggTSw22z47jxXo8CCWA3p+1MShMI96zaRfkZT2zcYuvJjf/dbamNxKm9Cd364Jri2/I9jOwIsbxry57Hzn1w4GMIhVoHAkHwb56VFF2V9OkTHcVQg+7Npkmv7nXoOO8giFg7E6vOkc1VkW9cEvKsagbhIyfxnihUg8Hjfg4+BxXJjKDBFK33BlieMra374Ji99+CahrUmIpoTHzwMLd127WuEH9ASf+uNzafCxHi8XFt8enqRFmRlF11vvWIxa8/z39MV6rNN/kOkd5a9onhlznQZbNmu5G1WzhCiSJb6hIRQj4MZoXXbe9sxhP7zx9bzvS1Z/V7lYU3Pls/KENahn0ny6rxIF8hcc2Y3NhXRFGgrXy20g7XSMSMxcHlEtzp2tmwAsHTFQ70qqjUn9VUcM/ltJAyZpRgxcbroi98BKQdpo8Z6LvC5XSzr3B04xiVqtyq/mx5KhlB7j8vPt0Z/CjXPGu5i5ySBhmf1rsKHKzrCM9kv2nCiSlLKgxSm5w2MuKGDmQUtwms282QAyXUG4uMp/4en+y+YKI5+k6c0ihYfoqItgkzxM+MTJ0jjviI599KupIOf2I9RTxIcY/VIy5D6AgAn8ixrt33Yu1hlTLlvL6ibgPHwXFzPzzSwkfOgBPoAriWvrC36klAhyGk6Kt9FObVJjR/scsmyTSXbTtYd9MKa9eDzJ2EKHriC9seau35PwJV430kl+vmVeT+yhiu2qlzQpWyZerKaUGke0fRhXYRdAWXE8sj/LdwunYGny+vqfdWRv+m36jdXhuj+3qH5P4gzpx6wgYGTZ+ismdP99xW3GDeo5Z6PPP4y6h+ErMvCYq2IKRR+JeEyY4bAV7OWmvlwoC5iuvT84OOC8IuW0nCMWFdCaIQmr7ksx6b7Yw=='; ?> 希望个位前辈们指点下~~~~~~~~~~~