Ann: AGM Presentation, page-22

Have a look at Note 14 'Significant Restrictions' to WQW's recent end of year financial report. I can't vouch for its accuracy, but it seems to set out the restrictions that would apply to XPD - dividends can be paid outside China without approval, subject to "procedural requirements" which are not explained:

http://www.asx.com.au//asxpdf/20170601/pdf/43jnf2q6cq85g0.pdf

So dividends likely to be ok, buybacks require approval that the directors appear to have given up trying to obtain.