Exceção de Controle de Acesso

Galera,

por favor,

Gostaria de saber a que se refere este tipo de Exceção…
Desenvolvi uma applet, da qual utiliza um biblioteca de terceiros para impressão de arquivos PDF…
Minha pagina na WEB invoca um método da Applet através do Java Script…

>>> Segue Exceção…

java.security.AccessControlException: access denied (java.util.PropertyPermission user.name read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPropertyAccess(Unknown Source)
at java.lang.System.getProperty(Unknown Source)
at com.qoppa.pdf.h.b.hb.<init>(Unknown Source)
at com.qoppa.pdf.h.b.s.<init>(Unknown Source)
at com.qoppa.pdf.h.b.hb.b(Unknown Source)
at com.qoppa.pdf.h.b.hb.b(Unknown Source)
at com.qoppa.k.e.hb(Unknown Source)
at com.qoppa.k.e.g(Unknown Source)
at com.qoppa.g.h.v.b(Unknown Source)
at com.qoppa.g.h.v.b(Unknown Source)
at com.qoppa.g.h.k.print(Unknown Source)
at com.qoppa.k.c.print(Unknown Source)
at sun.print.RasterPrinterJob.printPage(Unknown Source)
at sun.print.RasterPrinterJob.print(Unknown Source)
at com.qoppa.g.h.k.b(Unknown Source)
at com.qoppa.k.c.b(Unknown Source)
at com.qoppa.pdfPrint.PDFPrint.print(Unknown Source)
at applet.printfile.imprimir(printfile.java:24)
at applet.imprimir.imprime(imprimir.java:142)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.plugin.javascript.JSInvoke.invoke(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.plugin.javascript.JSClassLoader.invoke(Unknown Source)
at sun.plugin2.liveconnect.JavaClass$MethodInfo.invoke(Unknown Source)
at sun.plugin2.liveconnect.JavaClass$MemberBundle.invoke(Unknown Source)
at sun.plugin2.liveconnect.JavaClass.invoke0(Unknown Source)
at sun.plugin2.liveconnect.JavaClass.invoke(Unknown Source)
at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$DefaultInvocationDelegate.invoke(Unknown Source)
at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo.doObjectOp(Unknown Source)
at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$LiveConnectWorker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
<<<

Agradeço desde já!!!